(I think that) Previous versions of the CP used to grant another possible reward from ruins(production boost) instead of Revealing barbarian encampments. However the recent versions don't seem to do so. Any reason why? Besides, the revealing barb camps thing doesn't actually do anything sometimes... As in, it doesn't reveal any encampments.
I don't know about CP, but CBP still provides production-boosts. Also isn't CP just bugfixes, should it really change ruins at all?